Improvement in flasks for molding



JAMES J. JOHNSTON, OF ALLEGIIENY, PENNSYLVANIA.

IMPROVEMENT IN FLASKS FOR MOLDING.

Specification forming part of Letters Patent No. BLQI, (lated April 22,1856.

To @ZZ whom, t may concern:

. Be it known that I, JAMns JoNns JOHN- srON, of Allegheny,Pennsylvania, have in- Vented a new and useful machine for molding insand such articles as sad or smoothing irons, wagon-boxes, belt-pulleys,and such like patterns which require to be graduated in some particularswhile they remain the same or unchanged in other particulars; and I dohereby declare the following to be a full, clear, and exact descriptionof the same, reference being had to the annexed drawings', made part ofthis specification and lettered to correspond herewith.

In casting sad or smoothing` irons, wagonboxes, belt-pulleys, and suchlike articles it is always desirable to be able to cast them of anyweight, depth, breadth, or length, (according to the article in hand,)without changing the size of the pattern in some of its measurements.For instance, sad or smoothing irons of the same size of face arerequired to be of various weights, according as they are needed forhatters, washerwomens, or other use; and in the case of wagon-boxes theyare wanted of different lengths for different hubs, but without anychange of barrel as to thickness or inside or outside diameter; and withregard to pulleys for belts, the same diameter of pulley is often usedfor different widths of belts. At present it requires, in the ordinarvprocess of molding, a different set of patterns for different weights,length, or width. I effect molding these andsuch like articles ofVarious weight, length, and breadth, respectively, from the same patternor sets of patterns on one board by my machine, which is constructed asfollows:

A, Figure l, is a box or frame which may be cast of metal and of anyshape required. I represent in the drawings and in isometricalperspective a square box which fully illustrates the idea.

B are slide grooves set in pairs perpendicularly on the inside of anytwo opposite faces of the box.

O is a table or platform which is raised or lowered inside the box bymeans of a rack and pinion, as seen in Fig. 4, which is a central andvertical section in the line A B, Fig. l. Tongues D on the sides of thistable play in the slide-grooves B, and for convenience of constructionand certainty of action the table C may be an inverted box, as seen inFig. 4., to the sides F. F of which the metal plates carrying thetongues D are xed. It is best, however,to cast the box A and the table Cof one piece each, as .the machine would be firmer, stronger, and ofequable shrinkagepoints of great importance in this business. A shaft,G, carries the pinion. rIhis shaft has bearings in the box A, andextends outside the box sufficiently to carry an index-wheel, H, and ahandle, I, by raising or lowering the end of which handle the table C israised to any height desired, the height being ascertained by theindex-wheel, andthe wheel retained at that position by means of a dog orcatch, K, arranged on the outside of the box,

the catch being raised from the index-wheel by hand whenever required.Parts of the two rear sides of the box, Fig. l, are broken away to showthe table, tongues, and slide-grooves more clearly. The box may be seton feet L.

M, Fig. 4, is a cross-bar for the feet.

f On the table C, I place a follow-board, N, Fig. 2, which is kept toits place by pins O. On this follow-board I iix patterns*for instance,four smoothing-irons, P, the patterns being made of the greatest depthrequired for any weight of iron of that size of face. Similarfollow-boards with sets of wagon-box patterns, or with sets ofbelt-pulleys, or other such like patterns, can be used with this samemachine. On the box A, I place two pins, Q, which are to hold a plate,R, in place on the box A, the plate R being of the same size as the boxA, so that the plate rests on and square with the box. This plate R hasopenings which conform to a-corresponding pattern. For instance, theplate represented in Fig. 3 has openings for four smoothing-irons, suchas represented in Fig. 2, Figs. 2 and 3 being in isometricalperspective.

Sy on plate R are the gates or spaces. The pins Q also' serve as guidesfor the flasks, as they are successively applied to the entire machine,as described, for the process of molding the patterns in sand. To dothis the patterns are projected up through these openings by the rackand pinion, the weight, length, or width being adjusted as desired, andheld to that adjustment by the dog and index-wheel, and a fiask beingplaced on the plate, the sand is put in the flask and the mold I made inthe usual Way.

It is obvious that my process of molding articles herein named and othersuch articles has the following advantages: First, one machine willoperate consecutively any number of follow-boards and patterns andplates conforming in their openings to the patternsin hand; second, oneset of patterns serves for Having thus fully, clearly, and exactlydescribed the nature, construction, and operation of my improvement inmachines for molding in sand such articles as sad or smoothing irons,Wagon-boxes, pulleys, and such like articles,

whatI claim therein as new, and desire to secure by Letters Patent, is-

The employment of the table C, followboard N, and plate R, constructedand arranged as described, the Whole, when adjusted by the verticalmovement in guides, being for the purpose set forth.V

JAMES J. JOHNSTON.

Vit-nesses:

XVM. M. MCCAULEY, HENRY EvERDELL.

